Answer and explanation

Correct answer: A. to stop

  1. Step 1: 'Tell somebody to do' is the reported command pattern.
Answer
to stop.
Why not the others: "stop" is wrong because 'tell' + object needs 'to'. "that stop" is wrong because 'that' is ungrammatical without a verb form such as 'should stop'. "stopping" is wrong because 'tell' + object is followed by a to-infinitive.

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